SPECIFICATIONS
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Anthracite PVD coloured mainplate and bridges
Power Reserve
7 days -
Material
Stainless steel, Sapphire crystal and case back with anti-reflective coating
Diameter
41.00mm
Height
10.60 mm
Lug-to-Lug
46.20mm
Water-resistance
10 ATM / 100 m -
Black minute ring and small-second dial, numbers and indexes with Super-LumiNova® filling
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Calibre ARM21-M is Armin Strom’s skeletonized manual-wind double barrel movement with a 7-day power reserve and small seconds.
Functions
Hour, minute, small secondsImpulse
Double going barrelWinding Mechanism
ManualPlate and Bridges
Plate and bridges are decorated at the highest quality levelRegulating System
Flat hairspring with a variable inertia balance wheelFrequency
25,200 vphNumber of Jewels
35Number of Individual Parts
194 -
Steel, faceted polished hands with Super-LumiNova® filling
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Stainless steel with a double folding clasp.
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Material
Stainless SteelWidth lugs/buckle
22-20 mm
GSG SKU / 500-00085
Driving this dimension-defier is our ARM21 calibre. It’s a complete reimagining of our first in-house movement and reveals how far scientific design can evolve in just over 15 years. Inside, two barrels work in series to ensure consistent energy delivery for an entire week. Yes, the One Week will run for a week when fully wound. As horological artisans with a scientific foundation, we never over-promise — not even on the names of our products. At its core, finger bridges with clean, geometrical lines hold the two barrels in perfect symmetry, occupying the right-hand side of the movement. The energy is displayed through a power reserve indicator whose mechanism is inspired by the cone system of historical pocket watches. But has been reinterpreted with modern technology.
The One Week Manufacture Edition rejects the conventions of what a watch dial is supposed to look like. Instead, it presents time through a layered architecture of anthracite PVD-coated bridges and plates. Each component is positioned to create a mechanical landscape that reveals new details from every angle. The central hands, mounted on a geometrically sculpted bridge, seem to float above this mechanical terrain with precision. The innovative winding mechanism, placed on the dial side, and the three-dimensional skeletonised power reserve indicator further emphasise this architectural approach. This style extends through the case with its integrated bracelet, creating a seamless flow from the mechanical architecture within to the presence on the wrist.